21221332023 has 16 divisors (see below), whose sum is σ = 29005879680. Its totient is φ = 13795445664.

The previous prime is 21221332019. The next prime is 21221332051. The reversal of 21221332023 is 32023312212.

It is a happy number.

It is not a de Polignac number, because 21221332023 - 2² = 21221332019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221332823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383493 + ... + 435326.

It is an arithmetic number, because the mean of its divisors is an integer number (1812867480).

Almost surely, 2^21221332023 is an apocalyptic number.

21221332023 is a deficient number, since it is larger than the sum of its proper divisors (7784547657).

21221332023 is a wasteful number, since it uses less digits than its factorization.

21221332023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819038.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21221332023 its reverse (32023312212), we get a palindrome (53244644235).

The spelling of 21221332023 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirty-two thousand, twenty-three".